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Low pressure I'm assuming you mean low compression. Do a "wet test" first. If compression is still low, check your valve adjustments. tight valves will cause low compression. Also has this engine been overheated badly,or have excessive mileage on it? Could be a head gasket, or damaged rings/cylinders.

change the control modul. that control voltage to the coils. it sound like it not bleeding off fast enough the control modul is under the coils. befoe changing any part remove ground off battery. befor change any coils u could of swop to see if this is still not firing

It sounds as if you either have a faulty spark plug or a faulty high tension lead you need to check the plug and lead on the cylinder that is not firing. If they are OK the only other cause could be a lack of fuel to that cylinder.